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Comment by shadra

This is one of the beasts that you need to reveal at Durumu the forgotten encounter in order to complete achievement.

How to reveal all three?

Orange fog beast: This one only appears if its enlightened by yellow and red spectrum at the same time.Purple fog beast: This one only appears if its enlightened by blue and red spectrum at the same time.Green fog beast: This one only appears if its enlightened by blue and yellow spectrum at the same time.

Beasts are non-targetable. So all you have to do is reveal them only. And no, you don't have to reveal them at the same light spectrum phase.